What would happen if you traveled through an aurora?

First, at this elevation, the air is a pretty good vacuum. You might notice a
faint glow all around you, but not within 10 feet of you because the excited
gas is pretty thin. It would be like standing inside a rainbow.
We see aurora dramatically because of their contrast with
the dark sky. This contrast may not be as spectacular when you are right
inside it. Since the region is being bombarded by energetic electrons, I would
also suspect that your 'space craft' would build up quite an electric charge
too!